/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.nifi.record.path.util;

import java.util.Optional;

import org.apache.nifi.record.path.FieldValue;
import org.apache.nifi.record.path.RecordPathEvaluationContext;
import org.apache.nifi.record.path.paths.RecordPathSegment;
import org.apache.nifi.serialization.record.util.DataTypeUtils;

public class RecordPathUtils {

    public static String getFirstStringValue(final RecordPathSegment segment, final RecordPathEvaluationContext context) {
        final Optional<FieldValue> stringFieldValue = segment.evaluate(context).findFirst();
        if (!stringFieldValue.isPresent()) {
            return null;
        }

        final String stringValue = DataTypeUtils.toString(stringFieldValue.get().getValue(), (String) null);
        if (stringValue == null) {
            return null;
        }

        return stringValue;
    }
}
